Apple's App Store celebrates its fifth birthday this week, and plenty of game publishers and developers are using this as an excuse to boost their user numbers by giving away some cracking iOS games for free.

So far, the likes of Tiny Wings, Sword & Sworcery EP andInfinity Blade II have had their App Store prices changed to zero pounds and zero pence, with presumably more to come as Apple prepares to make a big deal about its app selling anniversary later this week. Keep an eye out for more. [Techtola via Kotaku]